Finding the Fourth Proportional to 1,022,705.50, 1,411,304.80 and 640,942.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,022,705.50 : 1,411,304.80 = 640,942.78 : x
2. Step 2: Convert to fraction form
   1,022,705.50/1,411,304.80 = 640,942.78/x
3. Step 3: Cross multiply
   1,022,705.50x = 1,411,304.80 × 640,942.78
4. Step 4: Simplify right side
   1,022,705.50x = 904,565,621,939.34
5. Step 5: Solve for x
   x = 904,565,621,939.34/1,022,705.50
6. Step 6: Final answer
   x = 884,482.99